(Video still via CNN)

Mayor Bill de Blasio and other NYC officials just completed a live presser regarding tonight's explosion in Chelsea.

They said the exact cause of what seems to have been an “intentional act” at 131 W. 23rd St. is not yet known, and that a second site—at 27th St.—was being investigated.

They have all but ruled out a gas explosion or construction accident. There is no indication that it was a terrorist event, at least by classical definition.

There are 29 confirmed injuries, none life-threatening, but one patient with a puncture wound was seriously injured.

Long before the presser, Donald Trump used the event to gin up supporters at a rally, stating flatly “a bomb went off in New York” before that had been confirmed.

Hillary Clinton took a more statesmanlike approach:

Hillary Clinton, on her campaign plane, responds to explosion in NYC pic.twitter.com/4tfyUE2vNc

— Liz Kreutz (@ABCLiz) September 18, 2016